Lexus NX: Problem Symptoms Table
PROBLEM SYMPTOMS TABLE
NOTICE:
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Before replacing the hybrid vehicle control ECU, refer to Registration.
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- When replacing the millimeter wave radar sensor assembly, always replace it with a new one. If a millimeter wave radar sensor assembly which was installed to another vehicle is used, the information stored in the millimeter wave radar sensor assembly will not match the information from the vehicle and a DTC may be stored.
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When the millimeter wave radar sensor assembly is replaced with a new one, adjustment of the radar sensor beam axis must be performed.
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- When replacing the forward recognition camera, replace it with a new one. If a forward recognition camera which was installed to another vehicle is used, the information stored in the forward recognition camera will not match the information from the vehicle and a DTC may be stored.
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If the forward recognition camera has been replaced with a new one or the windshield glass has been removed and installed, it is necessary to perform forward recognition camera adjustment.
HINT:
Forward recognition camera adjustment can be performed by using either One Time Recognition or Sequential Recognition.
One Time Recognition: Click here
Sequential Recognition: Click here
HINT:
- Use the table below to help determine the cause of problem symptoms. If multiple suspected areas are listed, the potential causes of the symptoms are listed in order of probability in the "Suspected Area" column of the table. Check each symptom by checking the suspected areas in the order they are listed. Replace parts as necessary.
- Inspect the fuses and relays related to this system before inspecting the suspected areas below.
- Determine the problem symptoms, then perform the respective inspection procedures.
- By using the vehicle control history, various control parameter history can be checked.
| Symptom | Suspected Area | Link |
|---|---|---|
| The dynamic radar cruise control system cannot be turned on using the cruise control main switch | CAN communication system | |
| Cruise control switch circuit | | |
| Cruise main indicator light circuit | | |
| Forward recognition camera | | |
| Hybrid vehicle control ECU | | |
| The dynamic radar cruise control mode cannot be changed between vehicle-to-vehicle distance control mode and constant speed control mode | CAN communication system | |
| Cruise control switch circuit | | |
| Hybrid vehicle control ECU | | |
| The vehicle-to-vehicle distance cannot be changed | CAN communication system | |
| Distance control switch circuit | | |
| Forward recognition camera | | |
| Vehicle speed setting cannot be performed (in constant speed control mode) | Fail-safe chart | |
| CAN communication system | | |
| Cruise control switch circuit | | |
| Stop light switch circuit | | |
| Hybrid control system | | |
| Electronically controlled brake system | | |
| Forward recognition camera | | |
| Hybrid vehicle control ECU | | |
| Vehicle speed setting cannot be performed (in vehicle-to-vehicle distance control mode) | Front Radar Sensor Temporary Unavailable (Optical Axis Misalignment) history | |
| Fail-safe chart | | |
| Forward recognition camera is temporarily unavailable | | |
| Millimeter wave radar sensor assembly is dirty | | |
| Millimeter wave radar sensor assembly beam axis not adjusted | | |
| CAN communication system | | |
| Cruise control switch circuit | | |
| Hybrid control system | | |
| Electric parking brake system | | |
| Millimeter wave radar sensor assembly | | |
| Forward recognition camera | | |
| Electronically controlled brake system | | |
| Hybrid vehicle control ECU | | |
| Control of vehicle speed by the dynamic radar cruise control system is canceled (in constant speed control mode) | Fail-safe chart | |
| CAN communication system | | |
| Cruise control switch circuit | | |
| Stop light switch circuit | | |
| Hybrid control system | | |
| Electronically controlled brake system | | |
| Hybrid vehicle control ECU | | |
| Control of vehicle speed by the dynamic radar cruise control system is canceled (in vehicle-to-vehicle distance control mode) | Fail-safe chart | |
| Forward recognition camera is temporarily unavailable | | |
| Millimeter wave radar sensor assembly is dirty | | |
| Millimeter wave radar sensor assembly beam axis not adjusted | | |
| CAN communication system | | |
| Cruise control switch circuit | | |
| Hybrid control system | | |
| Electric parking brake system | | |
| Millimeter wave radar sensor assembly | | |
| Forward recognition camera | | |
| Electronically controlled brake system | | |
| Hybrid vehicle control ECU | | |
| Hunting/vehicle speed is not constant (in constant speed control mode) | CAN communication system | |
| Electronically controlled brake system | | |
| Hybrid vehicle control ECU | | |
| Hunting/vehicle speed is not constant (in vehicle-to-vehicle distance control mode) | Millimeter wave radar sensor assembly is dirty | |
| Millimeter wave radar sensor assembly beam axis not adjusted | | |
| CAN communication system | | |
| Electronically controlled brake system | | |
| Millimeter wave radar sensor assembly | | |
| Hybrid vehicle control ECU | | |
| Vehicle speed control by the dynamic radar cruise control system is not canceled when the CANCEL switch is pushed | Cruise control switch circuit | |
| Hybrid vehicle control ECU | | |
| Moving the shift lever does not cancel control of vehicle speed by the dynamic radar cruise control system | Shift lock control unit assembly | |
| Shift lever position sensor | | |
| Hybrid control system | | |
| Hybrid vehicle control ECU | | |
| Operate the shift paddle switch does not cancel control of vehicle speed by the dynamic radar cruise control system (w/ Shift Paddle Switch) | Hybrid control system | |
| Shift paddle switch circuit | | |
| Hybrid vehicle control ECU | | |
| Depressing the brake pedal does not cancel control of vehicle speed by the dynamic radar cruise control system | Stop light switch circuit | |
| Hybrid vehicle control ECU | | |
| Control cannot be canceled while the vehicle is stopped (w/ Full-speed Range Following Function) | CAN communication system | |
| Electronically controlled brake system | | |
| Electric parking brake system | | |
| Seat belt warning system | | |
| Front door coutresy switch circuit | | |
| Hybrid vehicle control ECU | | |
| Parking brake ECU assembly | | |
| Control cannot be canceled by operating the parking brake | Electric parking brake system | |
| CAN communication system | | |
| Parking brake ECU assembly | | |
| Hybrid vehicle control ECU | | |
| Even though the millimeter wave radar sensor assembly and forward recognition camera are not dirty, the warning message "Radar Cruise Control Unavailable See Owner's Manual" is displayed | Millimeter wave radar sensor assembly | |
| Forward recognition camera | | |
| The vehicle approach warning buzzer does not sound | Meter / gauge system | |
| Check millimeter wave radar sensor assembly installation position | | |
| Check installation of forward recognition camera | | |
| Forward recognition camera | | |
| Millimeter wave radar sensor assembly | | |
| Even though the vehicle approach warning buzzer is sounding, brake control is not performed to decelerate the vehicle | Electronically controlled brake system | |
| CAN communication system | | |
| Forward recognition camera | | |
| Hybrid vehicle control ECU | | |
| Even though the SET function is operating, the cruise SET indicator does not illuminate | CAN communication system | |
| Cruise SET indicator light circuit | | |
| Hybrid vehicle control ECU | | |
| The cruise control indicator remains illuminated | CAN communication system | |
| Cruise main indicator light circuit | | |
| Hybrid vehicle control ECU | | |
| Indicators are not displayed on the multi-information display in the combination meter assembly | CAN communication system | |
| Hybrid vehicle control ECU | | |
| A buzzer does not sound when control of vehicle speed by the dynamic radar cruise control is canceled | CAN communication system | |
| Hybrid vehicle control ECU | |
READ NEXT:
Diagnosis System
DIAGNOSIS SYSTEM DIAGNOSIS FUNCTION (a) When a malfunction occurs in the dynamic radar cruise control system, the system turns off the cruise control indicator. At the same time, a short buzzer sounds
Dtc Check / Clear
DTC CHECK / CLEAR CHECK DTC (a) Connect the Techstream to the DLC3. (b) Turn the power switch on (IG). (c) Turn the Techstream on. (d) Enter the following menus: Powertrain / Radar Cruise1*1 or Radar
Fail-safe Chart
FAIL-SAFE CHART Constant Speed Control Mode: Condition Multi-information Display Master Warning Light Cruise Control Indicator Warning Buzzer When the following condition(s) occurs whil
SEE MORE:
Check Mode Procedure
CHECK MODE PROCEDURE NOTICE: Enter "Signal Check" from the "DTC Check" screen displayed on the Techstream to clear the output DTCs (both present and past). HINT:
DTCs can be stored more sensitively in check mode than in normal diagnosis mode.
Perform the check mode inspection when a malfunction
Components
COMPONENTS ILLUSTRATION *1 DECK FLOOR BOX LH *2 NO. 3 DECK BOARD SUB-ASSEMBLY *3 REAR DECK FLOOR BOX *4 NEGATIVE AUXILIARY BATTERY TERMINAL N*m (kgf*cm, ft.*lbf): Specified torque - - ILLUSTRATION *1 ECU INTEGRATION BOX RH *2 GLOVE COMPARTMENT DOOR ASSEMBL
